High And Middle-Speed Sides On The Network

Fig 1: Identifying HS-CAN And MS-CAN

Courtesy of VOLVO CARS CORPORATION

The network consists of two parts: a high speed side (HS CAN) which transmits signals/messages between the central electronic module (CEM) and control modules mainly in the engine compartment. A middle-speed side (MS CAN) which transmits signals/messages between the central electronic module (CEM) and control modules in the passenger compartment and the luggage compartment.

The interface between the high and middle-speed sides is supplied by the central electronic module (CEM) which converts the transmission speed up or down for communication between the two network sides.